UNIX command that says "proceed to the next command"?
Unix gurus,
I have a requirement to check whether a db is running or not and send an email if any or all of them are not running.
I have written the code for checking (in the same order):
1. the database processes
2. the listener process
3. the database login
If the database background processes (i.e., unix processes) are not running, then send email and this is working fine.
If they are running, then continue to the next check i.e., listener process. This is where I'm having problems.
I would like to know if there is any command that I can use in my if construct that says "proceed to the next command"?
Note:
1. I know that I can't use the continue command as I am using a loop and it will go to the next iteration skipping the required checks.
2. I know that I can totally remove the else part of the IF construct but I'm curious to know if there is any command that says "proceed to the next command".
3. send_mail is also a function that uses mailx to send emails.
Code:
## Call function to check background processes.
check_bkgrnd_process ${sid}
if [[ $? -ne 0 ]]; then
## Problem with background processes. Send email.
send_mail "${BKGRND_PROCESS_ERR_SUB}" "${MAIL_LIST}" "${BACKGRND_CHK_TMPFILE}"
else
## No problem with background processes. Send test email anyway.
##send_mail "${BKGRND_PROCESS_ERR_SUB}" "${MAIL_LIST}" "${BACKGRND_CHK_TMPFILE}"
fi
## Call function to check the db listener.
check_db_listener
if [[ $? -ne 0 ]]; then
## Problem with database listener. Send email.
send_mail "${LISTENER_CHK_ERR_SUB}" "${MAIL_LIST}" "${LISTENER_CHK_TMPFILE}"
else
## No problem with database listener. Send test email anyway.
##send_mail "${LISTENER_CHK_ERR_SUB}" "${MAIL_LIST}" "${LISTENER_CHK_TMPFILE}"
fi
## Call function to check database login.
check_db_login
if [[ $? -ne 0 ]]; then
## Error thrown - Issue with logging in to the database.
send_mail "${DB_LOGIN_ERR_SUB}" "${MAIL_LIST}" "${DB_LOGIN_CHK_TMPFILE}"
else
## Success - Send a test email anyway.
##send_mail "${DB_LOGIN_ERR_SUB}" "${MAIL_LIST}" "${DB_LOGIN_CHK_TMPFILE}"
fi
You mentioned wanting to keep the "else" part. Is that because you have other commands you want to run on occasion?
There is "break" which can be used from within loops. So you could have:
Code:
..
else
while true; do
echo yes
if .... ; then
echo email something
break;
else
echo do soemthing else
fi
done
echo Continuing from break or end of else
fi
Last edited by otheus; 02-19-2009 at 05:40 AM..
Reason: needed code end tag
@Otheus, no I don't have any commands to run in the else part. However, I wanted to know if there is a single command (not echo "" > file) that I can use to proceed to the next command.
Moreover, the IF construct is inside a for loop and hence, I can't use the "break" or "continue" commands too.
@Perderabo, yes seems like you've hit the bulls eye. That is exactly what I wanted.
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02-20-2009
UNIX command that says "proceed to the next command"?